package com.common.util;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.imageio.ImageIO;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

public class ImageUtil {
	 /**
     * @param im            原始图像
     * @param resizeTimes   倍数,比如0.5就是缩小一半,0.98等等double类型
     * @return              返回处理后的图像
     */
    private static BufferedImage zoomImage(BufferedImage im, float resizeTimes) {
        /*原始图像的宽度和高度*/
        int width = im.getWidth();
        int height = im.getHeight();

        /*调整后的图片的宽度和高度*/
        int toWidth = (int) (Float.parseFloat(String.valueOf(width)) * resizeTimes);
        int toHeight = (int) (Float.parseFloat(String.valueOf(height)) * resizeTimes);

        /*新生成结果图片*/
        BufferedImage result = new BufferedImage(toWidth, toHeight, BufferedImage.TYPE_INT_RGB);

        result.getGraphics().drawImage(im.getScaledInstance(toWidth, toHeight, java.awt.Image.SCALE_SMOOTH), 0, 0, null);
        return result;
    }
    /**
     * 把图片写到磁盘上
      * @param im
     * @param path     eg: C://home// 图片写入的文件夹地址
      * @param fileName DCM1987.jpg  写入图片的名字
      * @return
     */
    private static boolean writeNormalQuality(BufferedImage im, String fileFullPath) {
        File f = new File(fileFullPath);
        String fileType = getExtension(fileFullPath);
        if (fileType == null)
            return false;
        try {
            ImageIO.write(im, fileType, f);
            im.flush();
            return true;
        } catch (IOException e) {
            return false;
        }
    }
    
    public boolean writeHighQuality(BufferedImage im, String fileFullPath) {
        try {
            /*输出到文件流*/
            FileOutputStream newimage = new FileOutputStream(fileFullPath+System.currentTimeMillis()+".jpg");
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(newimage);
            JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(im);
            /* 压缩质量 */
            jep.setQuality(1f, true);
            encoder.encode(im, jep);
           /*近JPEG编码*/
            newimage.close();
            return true;
        } catch (Exception e) {
            return false;
        }
    }
    /**
     * 返回文件的文件后缀名
      * @param fileName
      * @return
    */
    private static String getExtension(String fileName) {
        try {
            return fileName.split("\\.")[fileName.split("\\.").length - 1];
        } catch (Exception e) {
            return null;
        }
    }
    public static boolean doThumbnail(String srcImagePaht,String destImagePath,int width)
    {
    	boolean doOk = false;
    	File srcFile = new File(srcImagePaht);
    	if(srcFile.exists())
    	{
    		try {
				BufferedImage im = javax.imageio.ImageIO.read(srcFile);
				int oldWidth = im.getWidth();
				//如果原图比要求的宽度还小，不进行处理,直接复制
				if(oldWidth<width)
				{
					doOk = writeNormalQuality(im,destImagePath);
				}
				else
				{
					float resizeTimes = (float)(width*1.0)/oldWidth;
					BufferedImage om = zoomImage(im,resizeTimes);
					doOk = writeNormalQuality(om,destImagePath);
				}
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
    	}
    	return doOk;
    }
    public static boolean doThumbnail(String srcImagePaht,String destImagePath,float resizeTimes)
    {
    	boolean doOk = false;
    	File srcFile = new File(srcImagePaht);
    	if(srcFile.exists())
    	{
    		try {
				BufferedImage im = javax.imageio.ImageIO.read(srcFile);
				BufferedImage om = zoomImage(im,resizeTimes);
				doOk = writeNormalQuality(om,destImagePath);
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
    	}
    	return doOk;
    }
    public static void main(String[] args) throws Exception{


        String srcImagePaht = "e:\\3156409_141828016911_2.jpg" ; 
         /*这儿填写你存放要缩小图片的文件夹全地址*/
        String destImagePath = "e:\\3156409_141828016911_1.jpg";  
        /*这儿填写你转化后的图片存放的文件夹*/
       
        
        ImageUtil.doThumbnail(srcImagePaht, destImagePath, 40);
        
    }    
}
